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How do I consider propeller damping in torsional vibration calculations?

Torsional vibration analysis

In the Nauticus Torsional Vibration tool, five different methods of damping calculation are available:

Archer approach: Consider the propeller damping as a consequence of the propeller’s torque characteristics. Derive the damping coefficient from the propeller law. Suitable for both fixed pitch propeller and controllable pitch propeller.

Frahm approach: Similar to Archer approach but using Frahm number.

Schwaneke approach: Use Schwaneke empirical formula to calculate the propeller damping. It is dependent on the propeller geometry.

Dynamic magnifier approach: Use the dynamic magnifier/dynamic magnifier percent to simulate the propeller damping. It is often used for MAN propellers.